The main focus of the Watershed Biogeochemistry Group is to investigate major elemental cycles in streams and their watersheds, particularly carbon, nitrogen, and phosphorus pools and fluxes. We are especially interested in quantifying and characterizing the rich array of organic molecules that exist in stream ecosystems, and serve as the main food source to microorganisms and consequently to all biological communities. Throughout the watershed, water is found in many places beyond stream channels, including aquifers, soils, and sediments. Our biogeochemistry laboratory has the capabilities to perform a wide range of chemistry analyses in water samples from all these places.
Watershed Biogeochemistry Staff
Watershed Biogeochemistry News
Recurring seasonal dynamics of microbial communities in stream habitats
Hullar, M. A. J., L. A. Kaplan, and D. A. Stahl. 2006. Applied and Environmental Microbiology 72:713–722.
Synthesis of 13C-labeled tracer for stream DOC: labeling tulip poplar carbon with 13CO2
Wiegner, T.N., L.A. Kaplan, J.D. Newbold, and P.H. Ostrom. 2005. Ecosystems 8:501–511.
Fluctuations of dissolved organic matter in river used for drinking water and impacts on conventional treatment plant performance
Volk, C., L.A. Kaplan, J. Robinson, B. Johnson, L. Wood, H.W. Zhu, and M. LeChevallier. 2005. Environmental Science and Technology 39(11):4258–4264.
Contribution of dissolved organic carbon to stream metabolism estimated with 13C-enriched tree tissue leachate
Wiegner, T.N.,L.A. Kaplan, J.D. Newbold, and P.H. Ostrom. 2005. Journal North American Benthological Society 24:48–67.
The role of organic matter in structuring microbial communities
Kaplan, L., M. Hullar, L. Sappelsa, D. Stahl, P. Hatcher, and S. Frazier. 2005. American Water Works Association, Denver, Colorado.
Molecular characterization of biodegradable dissolved organic matter using bioreactors and [12C/13C] tetramethylammonium hydroxide thermochemolysis GC-MS
Frazier, S.W., L.A. Kaplan, and P.G. Hatcher. 2005. Environmental Science and Technology 39:1479–1491.
